KEYBOARD UNIT
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Abstract
A MULTIPLE PAGE KEYBOARD UNIT USED IN COMPUTER ORIENTED DISPLAY TERMINALS FOR CONTROL, SWITCHING, A SIMILAR PURPOSES. A KEYBOARD IS COVERED BY THE PAGES OF ANY ONE OF A PLURALITY OF SPECIAL BOOKS, THE KEYS OF THE KEYBOARD PROTRUDING THROUGH APERTURES IN THE PAGES. THE FUNCTION OF A GIVEN KEY IS DETERMINED BOTH BY THE BOOK WHICH IS IN PLACE ON THE KEYBOARD, AND BY THE PAGE TO WHICH THAT BOOK IS OPENED. THIS IS ACCOMPLISHED BY AN ARRANGEMENT OF SWITCH MEANS WHICH SENSES BOTH THE IDENTITY OF THE BOOK AND THE PAGE TO WHICH THE BOOK IS OPENED.
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